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[FEATURE] API call to make geometries valid (port of ST_MakeValid)
This introduces QgsGeometry::makeValid() which will try to make a valid geometry out of invalid one. This is more complicated method than just doing a buffer with zero width, but it should not loose any vertices. Finally we should have a reliable way in QGIS to fix bad geometries! Ported the C code from lwgeom library to QGIS.
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